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• Given a list of IP address, how do you find min, max ?

  - by zeroin23

  In Java, i have an arrayList of ip address. how do i find the min and max ? I have used the Collection.min() but it doesnt work given a case like : 192.168.0.1 <--min 192.168.0.250 192.168.0.9 <--max how do i return 192.168.0.1 <--min 192.168.0.250 <--max instead?

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• Explain Type Classes in Haskell

  - by Tsubasa Gomamoto

  Hi, I am a C++ / Java programmer and the main paradigm I happen to use in everyday programming is OOP. In some thread I read a comment that Type classes are more intuitive in nature than OOP. Can someone explain the concept of type classes in simple words so that an OOP guy like me can understand it?

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• StringIndexOutOfBoundsException: String index out of range 0

  - by Evan F

  I'm trying to write a program to take the first letter of the user input to generate a username. I'm trying to write it so that if the user leaves the input blank, then the letter that would otherwise be taken to generate the username defaults to the letter 'z'. Here is my full code: import java.util.Scanner; /** UsernameGenerator.java Generates a username based on the users inputs. @author: Evan Fravert */ public class UsernameGenerator { /** * Generates a username based on the users inputs. *@param args command line argument */ public static void main(String[] args) { // abcde String first; String middle; String last; String password1; String password2; int randomNum; randomNum = (int) (Math.random() * 1000) + 100; Scanner userInput = new Scanner(System.in); System.out.println("Please enter your first name:"); first = userInput.nextLine(); String firstLower = first.toLowerCase(); System.out.println("Please enter your middle name:"); middle = userInput.nextLine(); String middleLower = middle.toLowerCase(); System.out.println("Please enter your last name:"); last = userInput.nextLine(); int lastEnd = last.length()-1; String lastLower = last.toLowerCase(); System.out.println("Please enter your password:"); password1 = userInput.nextLine(); System.out.println("Please enter your password again:"); password2 = userInput.nextLine(); char firstLetter = firstLower.charAt(0); char middleLetter = middleLower.charAt(0); char lastLetter = lastLower.charAt(0); char lastLast = lastLower.charAt(lastEnd); if first.length() == 0) { firstLetter = 'z'; } else { firstLetter = firstLower.charAt(0); } System.out.println("Your username is " + firstLetter + "" + middleLetter + "" + lastLetter + "" + "" + lastLast + "" + randomNum); System.out.println("Your password is " + password1); System.out.println("Welcome " + first + " " + middle + " " + last + "!"); } }

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• Blackberry - "[projectname].debug file is missing" and "I/O Error: Cannot find program "jar"

  - by TreeUK

  I'm running eclipse with the Blackberry Java Plug-in, working on a 1.4.5 Blackberry project. The project has been building and debugging in the emulator normally until I started getting: A prompt saying "[projectname].debug file is missing". A message in the Blackberry Packaging Console saying "I/O Error: Cannot find program "jar": CreateProcess error=2." Anyone have any ideas what could be causing this?

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• How to switch between the two spring context in runtime?

  - by Selector

  I have current ApplicationContext and I want to replace it by newAppContext ApplicationContext currentAppContext = getOldAppContext (); ApplicationContext newAppContext = loadAppContext (); If i do: currentAppContext.stop(); currentAppContext.close(); currentAppContext= newAppContext; And then try: currentAppContext.getBean("SampleBean"); I have follow error: java.lang.IllegalStateException: BeanFactory not initialized or already closed - call 'refresh' before accessing beans via the ApplicationContext How to substitute spring context?

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• Clean multiple JTextField

  - by redmarv

  Hi all! I was wondering about how to clean multiple JTextField in a Java applicatio, without setting the text with an empty string for each field. Any suggestions?

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• Convert an ArrayList to an object array

  - by marionmaiden

  Hello, Is there a command in java for conversion of an ArrayList into a object array. I know how to do this copying each object from the arrayList into the object array, but I was wondering if would it be done automatically. I want something like this: ArrayList<TypeA> a; // Let's imagine "a" was filled with TypeA objects TypeA[] array = MagicalCommand(a);

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• How does the Eclipse debugger gets the information about private variables inside the class?

  - by flash

  this was an interview question posed to me..I vaguely answered it uses Java reflections..but I was not sure. how does that work?

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• How to generate one jar with different executable classes in maven2?

  - by GuidoMB

  I have a big project that uses maven and I'm creating the project's jar. The problems is that the project has several classes that can be executed. How can I accomplish this? Every time that I try to execute a class I get this message java -jar library.jar ExecutableClass1 Failed to load Main-Class manifest attribute from library.jar

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• How was the first release of JDK Unit Tested?

  - by Sameer Patil

  Can someone please explain the following How was the first JDK release unit Tested? Since Junit came after Java how did they do it? Are the current releases using Junit to test the JDK API? Regards

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• Lightest Database to be packed with an application

  - by Yatendra Goel

  I am developing a Java Desktop Application and want a light database that can be used with Hibernate and that can be packed with an application. I was going to use Derby database. It's size is near 2 MB. But before that I wanted to have views of experts on SO. Will it work with Hibernate? Actually, I am new to Hibernate and was studying that it requires a Dialect for a database so Is Hibernate has dialect for Derby?

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• UML reverse engineering tools for Eclipse or Maven

  - by Marco

  Hi, do you know any good reverse engineering tool that creates UML diagrams from Java code and Hibernate mappings across multiple projects, in Eclipse or Maven (not in the Javadoc)? Thanks

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• JSplitPane SetDividerLocation Problem

  - by Goutham

  I have a JSplitPane which when shown should split the pane by 50%. Now on giving an argument of 0.5 (as suggested) to setDividerLocation, Java seems to treat it as a normal number instead of a percentage. As in, the divider, instead of going to the middle of the pane, is almost at the start of the left pane (the pane is vertically split). Any work arounds?

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• How to find out or where to specify path of the JavaEE project?

  - by Milan

  I develop Java EEapplication and I have to create some files in the src folder in the my application. But I dont where or how to specify the path. I want my application to be portable. It means just to say TestProject/src/.... and not C:/bla/bla/TestProject/src/... do we specify this in some app file like web.inf, meta-inf or its just some trick. Thanks!

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• How to create a process that cannot be killed?

  - by rgksugan

  I am running my java application. It shows up in the process tab of the task manager. I dont want users to kill that process? And if possible i dont want my process to be in the process list also.

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• Regex for Eclipse/Flash Builder File Search for comments?

  - by Brian Bishop

  In Eclipse (and Flash/Flex Builder) you get the option with Ctrl+Shift+F to do a file search and look for a regular expression. Would be a real handy thing to know. I want to find the word negate if it appears in a Flex/java comment like the following: // It was negated because or /* The negate option was.... */ or /** * We have to negate the value */ Any ideas? Will test them out at http://www.regexplanet.com/simple/index.html

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• find decimal in a given number

  - by chandu

  Hi, How can i find decimal(dot) in a given number in java. I am getting input from user, he may give integer or float value. I need to find he entered integer or float , is it possible? if yes could u tell me please. -- Thanks

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• caching the form values

  - by ha22109

  Hello , I have a search form.When user post the search form i take the user to the result page which has search form and results of the search.Now if the user click on the back button of the browser ,i want that he should be the search page form filled with his values.I am using java

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• how can we get images through cache once they are in memory and how to make such a logic

  - by sharma

  Dear all, I making a web application,i want to store images in cache ,next time i dont want to get images from network.how can i implement using java,using weakhaspmap or hashmap.

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• Array increment operator

  - by Stardust

  Could any one please tell me the meaning of "++" with array in the following code in Java: int [ ] arr = new int[ 4 ]; for(int i = 0; i < arr.length; i++){ arr[ i ] = i + 1; System.out.println(arr[ i ]++); } what is arr[ i ]++ meaning in above code, and why we can't do like: arr[ i ]++ = i + 1;

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• How is the implementation of LinkedHashMap different from HashMap?

  - by Passionate programmer

  If LinkedHashMap's time complexity is same as HashMap's complexity why do we need HashMap? What are all the extra overhead LinkedHashMap has when compared to HashMap in Java?

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• How to convert an ArrayList containing Integers to primitive int array?

  - by Snehal

  I'm trying to convert an ArrayList containing Integer objects to primitive int[] with the following piece of code, but it is throwing compile time error. Is it possible to convert in Java? List<Integer> x = new ArrayList<Integer>(); int[] n = (int[])x.toArray(int[x.size()]);

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• Build a road network out of shapefile coordinates

  - by Sameer

  I want to build a road network from the ESRI shapefiles. I am able to read the data from the .shp files but unable to proceed any further with building the road network out of the shapefile coordinates and display it on the screen. I am not that expirienced in Java. I would appreciate any kind of suggestions on how should i proceed now.

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• Object or primitive type

  - by John

  Hi, Can someone explain to me the usage of Integer, Boolean etc in place of their primitive types in JAVA? I can't seem to grasp the advantages their are providing. They seem to create unnecessary problems of handling null values. Thanks!

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• Prevent drop down list options scrolling on Windows in SWT

  - by parxier

  One of the drop down lists in my Java SWT application has 8 fixed options. When I click on it only 5 first options are visible and I have to scroll the list down to view the rest. Is there any way to force it to make all options visible without having to scroll down? There is another similar .NET application that has same drop down list with the same options and they all are visible without having to scroll down!

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